Effects of <i>Achnatherum inebrians</i> ecotypes and endophyte status on plant growth, plant nutrient, soil fertility and soil microbial community

Jin, Yuanyuan; Chen, Zhenjiang; He, Yan; White, James F.; Malik, Kamran; Chen, Taixiang; Li, Chunjie

doi:10.1002/saj2.20420

Cited by 3 publications

(1 citation statement)

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“…In the present study, after a four-day incubation, it was observed that bacterial community structure, rather than total bacterial abundance, showed a stronger response to fertilization. Nitrogen fertilization has been demonstrated to be a significant factor in shaping soil microbial community (Yuan et al, 2015;Wu et al, 2021;Jin et al, 2022), probably by providing substrates and energy sources for indigenous microbes or due to nutrients imbalances resulting from a pulse input of N (Eo and Park, 2016). The bacterial abundance remained relatively stable after the 96-h incubation, which is consistent with the fact that soil bacteria generally have very slow growth rates, with a doubling time being over 100 days (Harris and Paul, 1994).…”

Section: Discussionsupporting

confidence: 54%

Immediate response of paddy soil microbial community and structure to moisture changes and nitrogen fertilizer application

et al. 2023

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Water and fertilizer managements are the most common practices to maximize crop yields, and their long-term impact on soil microbial communities has been extensively studied. However, the initial response of microbes to fertilization and soil moisture changes remains unclear. In this study, the immediate effects of nitrogen (N)-fertilizer application and moisture levels on microbial community of paddy soils were investigated through controlled incubation experiments. Amplicon sequencing results revealed that moisture had a stronger influence on the abundance and community composition of total soil bacteria, as well as ammonia oxidizing-archaea (AOA) and -bacteria (AOB). Conversely, fertilizer application noticeably reduced the connectivity and complexity of the total bacteria network, and increasing moisture slightly exacerbated these effects. NH4+-N content emerged as a significant driving force for changes in the structure of the total bacteria and AOB communities, while NO3−-N content played more important role in driving shifts in AOA composition. These findings indicate that the initial responses of microbial communities, including abundance and composition, and network differ under water and fertilizer managements. By providing a snapshot of microbial community structure following short-term N-fertilizer and water treatments, this study contributes to a better understanding of how soil microbes respond to long-term agriculture managements.

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Section: Discussionsupporting

confidence: 54%

Immediate response of paddy soil microbial community and structure to moisture changes and nitrogen fertilizer application

et al. 2023

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Interactions between Epichloë endophyte and the plant microbiome impact nitrogen responses in host Achnatherum inebrians plants

Jin,

Chen,

White

et al. 2024

Microbiol Spectr

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The clavicipitaceous fungus Epichloë gansuensis forms symbiotic associations with drunken horse grass ( Achnatherum inebrians ), providing biotic and abiotic stress protection to its host. However, it is unclear how E. gansuensis affects the assembly of host plant-associated bacterial communities after ammonium nitrogen (NH 4 + -N) treatment. We examined the shoot- and root-associated bacterial microbiota and root metabolites of A. inebrians when infected (I) or uninfected (F) with E. gansuensis endophyte. The results showed more pronounced NH 4 + -N-induced microbial and metabolic changes in the endophyte-infected plants compared to the endophyte-free plants. E. gansuensis significantly altered bacterial community composition and β-diversity in shoots and roots and increased bacterial α-diversity under NH 4 + -N treatment. The relative abundance of 117 and 157 root metabolites significantly changed with E. gansuensis infection under water and NH 4 + -N treatment compared to endophyte-free plants. Root bacterial community composition was significantly related to the abundance of the top 30 metabolites [variable importance in the projection (VIP) > 2 and VIP > 3] contributing to differences between I and F plants, especially alkaloids. The correlation network between root microbiome and metabolites was complex. Microorganisms in the Proteobacteria and Firmicutes phyla were significantly associated with the R00693 metabolic reaction of cysteine and methionine metabolism. Co-metabolism network analysis revealed common metabolites between host plants and microorganisms. IMPORTANCE Our results suggest that the effect of endophyte infection is sensitive to nitrogen availability. Endophyte symbiosis altered the composition of shoot and root bacterial communities, increasing bacterial diversity. There was also a change in the class and relative abundance of metabolites. We found a complex co-occurrence network between root microorganisms and metabolites, with some metabolites shared between the host plant and its microbiome. The precise ecological function of the metabolites produced in response to endophyte infection remains unknown. However, some of these compounds may facilitate plant-microbe symbiosis by increasing the uptake of beneficial soil bacteria into plant tissues. Overall, these findings advance our understanding of the interactions between the microbiome, metabolome, and endophyte symbiosis in grasses. The results provide critical insight into the mechanisms by which the plant microbiome responds to nutrient stress in the presence of fungal endophytes.

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The influence of timing and planting proportion on the intraspecific competitiveness ability of drunken horse grass (Achnatherum inebrians (Hance) Keng) by fungal endophyte infection

Cao,

Yao,

Wei

et al. 2024

PLANT SOIL ENVIRON

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Drunken horse grass (Achnatherum inebrians (Hance) Keng) is a toxic perennial bunchgrass species native to several provinces in Northwest China (Zhang et al. 2015a). Due to its exceptional tolerance to various environmental stresses including drought (Cui et al. 2022), grazing (Yao et al. 2015), cold temperatures (Chen et al. 2016), sandy environments (Wang et al. 2021), pests (He et al. 2021), pathogenic fungi (Kou et al. 2021), and heavy metals (Jin et al. 2022), drunken horse grass is capable of enduring these challenges.

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Effects of Achnatherum inebrians ecotypes and endophyte status on plant growth, plant nutrient, soil fertility and soil microbial community

Cited by 3 publications

References 118 publications

Immediate response of paddy soil microbial community and structure to moisture changes and nitrogen fertilizer application

Immediate response of paddy soil microbial community and structure to moisture changes and nitrogen fertilizer application

Interactions between Epichloë endophyte and the plant microbiome impact nitrogen responses in host Achnatherum inebrians plants

The influence of timing and planting proportion on the intraspecific competitiveness ability of drunken horse grass (Achnatherum inebrians (Hance) Keng) by fungal endophyte infection

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